Just got an email from AGR:
Well that's nice, as I suspect I won't be doing a whole lot of Amtrak traveling this summer, and maybe not even that much in the fall.
Tier Status – Your Select Plus status will be extended for an additional year, through February 28, 2022. We know that tier status is important to you and have made this update so that you don't need to worry about losing your benefits. No action is needed from you—your status will be automatically extended.
Well that's nice, as I suspect I won't be doing a whole lot of Amtrak traveling this summer, and maybe not even that much in the fall.